usb: chipidea: udc: add new API ci_hdrc_gadget_connect

This API is used enable device function, it is called at below
situations:
- VBUS is connected during boots up
- Hot plug occurs during runtime
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Jun Li <jun.li@nxp.com>

drivers/usb/chipidea/udc.c

@@ -1524,23 +1524,13 @@ static const struct usb_ep_ops usb_ep_ops = {
 /******************************************************************************
  * GADGET block
  *****************************************************************************/
-static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
+/**
+ * ci_hdrc_gadget_connect: caller makes sure gadget driver is binded
+ */
+static void ci_hdrc_gadget_connect(struct usb_gadget *_gadget, int is_active)
 {
 	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
-	unsigned long flags;
-	int gadget_ready = 0;
-
-	spin_lock_irqsave(&ci->lock, flags);
-	ci->vbus_active = is_active;
-	if (ci->driver)
-		gadget_ready = 1;
-	spin_unlock_irqrestore(&ci->lock, flags);
 
-	if (ci->usb_phy)
-		usb_phy_set_charger_state(ci->usb_phy, is_active ?
-			USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
-
-	if (gadget_ready) {
 	if (is_active) {
 		pm_runtime_get_sync(&_gadget->dev);
 		hw_device_reset(ci);
@@ -1559,7 +1549,26 @@ static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
 		pm_runtime_put_sync(&_gadget->dev);
 		usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
 	}
-	}
+}
+
+static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
+{
+	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
+	unsigned long flags;
+	int gadget_ready = 0;
+
+	spin_lock_irqsave(&ci->lock, flags);
+	ci->vbus_active = is_active;
+	if (ci->driver)
+		gadget_ready = 1;
+	spin_unlock_irqrestore(&ci->lock, flags);
+
+	if (ci->usb_phy)
+		usb_phy_set_charger_state(ci->usb_phy, is_active ?
+			USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
+
+	if (gadget_ready)
+		ci_hdrc_gadget_connect(_gadget, is_active);
 
 	return 0;
 }
@@ -1785,18 +1794,10 @@ static int ci_udc_start(struct usb_gadget *gadget,
 		return retval;
 	}
 
-	pm_runtime_get_sync(&ci->gadget.dev);
-	if (ci->vbus_active) {
-		hw_device_reset(ci);
-	} else {
+	if (ci->vbus_active)
+		ci_hdrc_gadget_connect(gadget, 1);
+	else
 		usb_udc_vbus_handler(&ci->gadget, false);
-		pm_runtime_put_sync(&ci->gadget.dev);
-		return retval;
-	}
-
-	retval = hw_device_state(ci, ci->ep0out->qh.dma);
-	if (retval)
-		pm_runtime_put_sync(&ci->gadget.dev);
 
 	return retval;
 }